平行双涡脱落形态下并列倒角柱体水动力特性分析  

Hydrodynamic characteristics analysis of parallelized-arranged cylinders with different rounded radii under symmetric flow

作　　者：于定勇[1] 赵一 康骁 YU Dingyong;ZHAO Yi;KANG Xiao(College of Engineering,Ocean University of China,Qingdao 266100,China)

机构地区：[1]中国海洋大学工程学院,山东青岛266100

出　　处：《海洋湖沼通报》2023年第3期7-16,共10页Transactions of Oceanology and Limnology

基　　金：国家自然科学基金项目(51739010)。

摘　　要：为研究尾流为平行双涡脱落形态下并列不同倒角柱体的绕流水动力特性,本文使用Fluent软件,采用大涡模拟方法模拟了雷诺数Re=3900、3种间距比、5种不同倒角情况下并列柱体的三维流场。验证了模型的有效性,分析了平行双涡脱落形态下柱体后方瞬时流场、时均流场、水动力参数的变化情况。分析结果表明:随着倒角半径R+的增大,并列柱体剪切层稳定性逐渐增强;R^(+)=0.1时柱体后流体在X方向和Y方向速度波动范围和波动强度最大;R^(+)=0.4时柱体所受平均阻力系数、升力系数均方根最小。本文研究结果可为相关工程设计中根据不同影响因素选取合适的倒角半径提供参考。In order to study the dynamic characteristics of the flow around the parallelized-arranged cylinders with different rounded radii when the vortex shedding is symmetric flow,this paper simulated the three-dimensional flow around cylinders with 3 spacing ratios and 5 different rounded radii under the Reynolds number of 3900 by using Fluent software and the method of Large Eddy.After the effective verification of the model,the changes of the instantaneous flow field,the time averaged flow field and the hydrodynamic parameters were obtained and analyzed.The results showed that with the increase of the rounded radii,the stability of the shear layer of the parallelized-arranged cylinders was gradually enhanced with different R^(+).The instantaneous velocity fluctuation range and intensity after the cylinders in x direction and y direction were larger than other cylinders with R^(+)=0.1;the average drag coefficient and the root mean square of the lift coefficient of the cylinders were the minimum with R^(+)=0.4.The results could be used as a reference for relevant engineering design to select cylinders with an appropriate rounded radii according to different influencing factors.

关 键 词：倒角半径 绕流 并列布置 水动力参数 平行双涡脱落 

分 类 号：TV143[水利工程—水力学及河流动力学]